CN1292013A - Process for rigid polyurethane foams - Google Patents

Process for rigid polyurethane foams Download PDF

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Publication number
CN1292013A
CN1292013A CN99803273A CN99803273A CN1292013A CN 1292013 A CN1292013 A CN 1292013A CN 99803273 A CN99803273 A CN 99803273A CN 99803273 A CN99803273 A CN 99803273A CN 1292013 A CN1292013 A CN 1292013A
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CN
China
Prior art keywords
pentane
trimethylmethane
iso
mixture
pentamethylene
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN99803273A
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Chinese (zh)
Inventor
R·德沃斯
W·巴佐
G·L·J·G·比斯曼斯
L·F·L·科尔曼
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HENTZMAN ICI CHEMICAL PRODUCT CO Ltd
Huntsman International LLC
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HENTZMAN ICI CHEMICAL PRODUCT CO Ltd
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Publication of CN1292013A publication Critical patent/CN1292013A/en
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/14Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/122Hydrogen, oxygen, CO2, nitrogen or noble gases
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72Polyisocyanates or polyisothiocyanates
    • C08G18/74Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/76Polyisocyanates or polyisothiocyanates cyclic aromatic
    • C08G18/7657Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
    • C08G18/7664Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2110/00Foam properties
    • C08G2110/0025Foam properties rigid
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2110/00Foam properties
    • C08G2110/0041Foam properties having specified density
    • C08G2110/005< 50kg/m3
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2205/00Foams characterised by their properties
    • C08J2205/10Rigid foams
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04Polyurethanes

Abstract

Process for preparing rigid polyurethane or urethane-modified polyisocyanurate foams comprising the step of reacting an organic polyisocyanate with a polyfunctional isocyanate-reactive component in the presence of a blowing agent mixture comprising from 50 to 90 % by weight of cyclopentane and from 10 to 50 % by weight of a mixture comprising isopentane and/or n-pentane and isobutane and/or n-butane wherein the weight ratio of isopentane and/or n-pentane over isobutane and/or n-butane is between 5/95 and 95/5.

Description

The manufacture method of rigid polyurethane foams
The present invention relates to the manufacture method of urethane or urethane-modified poly-isocyanurate rigid foam and the prepared porous plastics of method thus, the novel compositions that also relates to this method and adopted.
Urethane and the urethane-modified common manufacture method of poly-isocyanurate rigid foam are that the suitable polyisocyanates and the compound of isocyanate-reactive (normally polyvalent alcohol) are reacted.One of purposes of this type of foam is as thermal insulation material, for example is used as the structured material of refrigerating plant.The heat-insulating property of rigid foam depends on many factors, for the rigid foam of closed-cell, comprising the size of abscess and the thermal conductivity of abscess inclusion.
In producing urethane and urethane-modified polyisocyanurate foamed plastics extensively employing be the fluorochlorohydrocarbon of perhalogeno, especially trichlorofluoromethane (CFC-11) as a class material of whipping agent.These whipping agents, especially CFC-11 are because of having extremely low thermal conductivity so can make prepared rigid foam possess effective heat-insulating property.Recently people pay close attention to fluorochlorohydrocarbon to causing the potentiality of ozone-depleting in the atmosphere; this just causes pressing for the reaction system that exploitation can replacement fluorine chlorocarbon whipping agent; this class equivalent material is that environment protection institute is receptible, and has necessary performance by the porous plastics of its manufacturing in many Application Areass.
The substituting whipping agent of this type of that is proposed in prior art comprises that hydrochlorofluorocarsolvent, hydrofluorocarbon and particularly hydro carbons are alkane and cycloalkane, as Trimethylmethane, Skellysolve A, iso-pentane, pentamethylene with and composition thereof.
The mixture of pentamethylene and Trimethylmethane preferably.As described the sort of in European patent EP 421269; The mixture that also has pentamethylene and iso-pentane or Skellysolve A, the sort of described in WO94/25514.
The object of the present invention is to provide a kind of hydrocarbon blowing agent mixture, this mixture can improve the performance of porous plastics, can make processing become easy simultaneously again.
Why these purposes of the present invention can reach, be because in make urethane and urethane-modified poly-isocyanurate rigid foam by polyisocyanates and isocyanate-reactive component, used a kind of blowing agent blends, this mixture comprises pentamethylene and the iso-pentane of 10~50wt% and/or the mixture of Skellysolve A and Trimethylmethane and/or normal butane of 50~90wt%, and wherein the weight ratio of iso-pentane and/or Skellysolve A and Trimethylmethane and/or normal butane is 5/95~95/5.
Adopt this blowing agent blends can make processing become more easy, and can improve heat-insulating property than the mixture that adopts pentamethylene and Trimethylmethane.
Than adopting pentamethylene and exclusive OR Skellysolve A mixture, adopt mixture of the present invention can make the porous plastics that dimensional stability is improved, this is because can obtain more low-density stable foam body.
Best, the content of pentamethylene is 60~90wt%, is 60~80wt%, the most preferred 70~75wt% of being more preferably in said blowing agent blends; The weight ratio of iso-pentane and/or Skellysolve A and Trimethylmethane and/or normal butane is preferably 90/10~20/80, more preferably be 75/25~25/75, most preferred be 2/1~1/2.
In blowing agent blends of the present invention, adopt iso-pentane to be better than the employing Skellysolve A, same, adopt Trimethylmethane to be better than the employing normal butane.
The example of used preferred blowing agent blends can be listed below among the present invention: the mixture that contains 70wt% pentamethylene, 20wt% iso-pentane and 10wt% Trimethylmethane, the mixture that contains 70wt% pentamethylene, 10wt% iso-pentane and 20wt% Trimethylmethane contains the mixture of 75wt% pentamethylene, 15wt% iso-pentane and 10wt% Trimethylmethane.
The suitable isocyanate-reactive component that will adopt among the present invention comprises those known isocyanate-reactive components that are used to make urethane or urethane-modified poly-isocyanurate rigid foam in any this area.For preparation rigid foam particularly importantly polyalcohols and polyol blends, its average hydroxyl number is 300~1000, especially 300~700mg KOH/g, and its hydroxy functionality is 2~8, especially 3~8.Suitable polyvalent alcohol expounds adequately in prior art, comprising the oxirane hydro carbons, contains the product of the initiator for reaction of 2~8 reactive hydrogen atoms as oxyethane and/or propylene oxide and each molecule.Suitable initiator comprises: polyalcohols such as glycerine, TriMethylolPropane(TMP), trolamine, tetramethylolmethane, sorbyl alcohol and sucrose, polyamines class such as quadrol, tolylene diamine (TDA), diaminodiphenylmethane (DADPM) and polymethylene polyphenylene polyamines and alkamine such as thanomin and diethanolamine, and the mixture of this type of initiator.Other suitable polymeric polyalcohols comprises by the polyvalent alcohol of the ethylene glycol of suitable proportion and higher functionality and dicarboxylic acid or poly carboxylic acid condensation and the polyester that makes.Also have another kind of suitable polymerized polyalcohol, comprise hydroxy-end capped polythioether, polymeric amide, polyesteramide, polycarbonate, polyacetal, polyolefine and polysiloxane.The particularly preferred isocyanate-reactive compound that plan is used for the hydrocarbon foaming system is the polyvalent alcohol that the polyether glycol that amine causes, especially aromatic amine cause.The polyether glycol that causes as TDA-and DADPM, as in WO97/48748, narrated those, the content of this patent is incorporated this paper into as a reference.
The suitable organic multiple isocyanate that is used for the inventive method comprises that this area is in order to make any in urethane or urethane-modified known those polyisocyanates of poly-isocyanurate rigid foam, especially aromatic polyisocyanate as with its 2,4 '-, 2,2 '-and the '-diphenylmethane diisocyanate that provides of 4,4 '-isomer and composition thereof form; The mixture of '-diphenylmethane diisocyanate (MDI) and its oligopolymer, this oligopolymer is referred to as " thick " or polymeric MDI (polymethylene polyphenylene(poly)isocyanate) in the art, and the functionality of its isocyanic ester is greater than 2; With its 2,4-and 2, the tolylene diisocyanate that 6-isomer and composition thereof form provides; L,5 naphthylene diisocyanate; And 1, the 4-phenylene vulcabond.Other organic multiple isocyanate that can mention comprises aliphatic vulcabond, as isophorone diisocyanate, 1, and 6-hexane diisocyanate and 4,4 '-dicyclohexyl methane diisocyanate.
The consumption of polyisocyantates composition and many functional group isocyanates's reactive composition that will react with it depends on the character of the urethane that will make or urethane-modified poly-isocyanurate rigid foam, and this point is easy to make decision for a person skilled in the art.
Known other pneumatogen that is used to make rigid polyurethane foams also can use with hydrocarbon blowing agent mixture of the present invention.The example of these pneumatogens comprises other hydro carbons, dialkyl ether, ring alkylidene group ethers and ketone, fluoro ethers, chlorofluorocarbon class, perfluoroalkanes, and especially hydrochlorofluorocarsolvent class and hydrofluorocarbon class.
The example of suitable hydrochlorofluorocarsolvent class comprises 1-chloro-1,2-C2H4F2 C2H4F2,1-chloro-2,2-C2H4F2 C2H4F2,1-chloro-1,1-C2H4F2 C2H4F2,1,1-two chloro-1-fluoroethane and monochlorodifluoromethanes.
Suitable hydrofluorocarbon class comprises 1,1,1,2-Tetrafluoroethane, 1,1,2,2-Tetrafluoroethane, trifluoromethane, heptafluoro-propane, 1,1,1-Halothane, 1,1,2-Halothane, 1,1,1,2,2-pentafluoropropane, 1,1,1,3-tetrafluoropropane, 1,1,1,3,3-pentafluoropropane and 1,1,1,3,3-five fluorine normal butanes.
Usually the compound with water or other release of carbon dioxide uses with said these pneumatogens.When making water as chemical blowing promotor, it is 0.2~5wt% of benchmark that its consumption is generally in the isocyanate-reactive compound, is preferably 0.5~3wt%.
The whipping agent total amount that will use in the reaction system of making foamed polymer material is easy to make decision by those skilled in the art, is 2~25% of benchmark and be generally in the reaction system gross weight.
Except polyisocyanates and many functional group isocyanates's reactive composition and blowing agent blends, make and generally also to comprise one or more auxiliary agent or additives commonly used in making urethane or urethane-modified poly-isocyanurate rigid foam prescription in the reaction mixture of porous plastics.The optional additive of this class comprises the filler of the haloalkylphosphate of low molecular weight polyols, foaming stabilizer or the tensio-active agent of linking agent such as trolamine and so on such as the tin compound of siloxanes-oxyalkylene copolymers, urethane catalyst such as stannous octoate or dibutyl tin laurate and so on or tertiary amine, isocyanate catalyst, fire retardant such as tricresyl phosphate chloropropyl ester of dimethylcyclohexylam,ne or triethylenediamine and so on and so on and carbon black and so on.
Making according to the inventive method in the operation of rigid foam, the hybrid system of a known step foaming, prepolymer or half pre-thing technology and routine can be combined use, rigid foam then can be made sheet material, mo(u)lded item, cavity stopping composition, spray foam body, frothing foam body or comprise such as other materials such as fiber board, plasterboard, plastics, paper or metals at interior laminated plate material.
Way is easily in many Application Areass, is being that production of polyurethane provides various components with the form based on elementary polyisocyanates and isocyanate-reactive component pre-mixed ingredients separately.Specifically, many reaction systems all adopt a kind of polyisocyanates reactive composition as the main additive of whipping agent and so on that contains except polyisocyanates reactive component or its various ingredients.
Therefore, the present invention also provides a kind of polyisocyanates reactive composition that comprises blowing agent blends of the present invention.
The present invention is illustrated with following embodiment, but is not subjected to the restriction of these embodiment.
Embodiment 1~5
Fill inner container of icebox with the urethane batching that contains listed each component in the following table 1.
Polyvalent alcohol is the polyhydric alcohol composition of a kind of OH value for 390mg KOH/g; Isocyanic ester is poly-MDI composition.
Follow the tracks of reaction process with cream time (reaction mixture begins the required time of foaming) and wire drawing time (reaction mixture is reached the required time of transition point of crosslinked body by fluid).
According to the ISO845 standard test free initial density-emitting of porous plastics.
The measuring method of flow index is as follows: with reference foam doses of plastics mobile height setting in a special pipe of certainweight is 1.00; Again sample foams doses of plastics mobile height in this same pipe of identical weight is measured and compared with the height of this reference foam doses of plastics.The porous plastics (embodiment 1) of pentamethylene foaming is got and is made the reference foam plastics.
λ value under having measured 10 ℃ according to ASTM C518 method.
Measure the foaming degree of porous plastics with appearance method.
Filling weight represents to be filled with the inner container of icebox of porous plastics and the weight difference between the unfilled inner container of icebox, and to a heavy-walled and have the monomer accumulated ice case of model 1 of simple airflow circulation mode and the refrigerator of a combined model 2 with compound airflow circulation mode has been measured this filling weight.
Oppositely heat leak has determined when reaching stable state (power loss) rate the power loss (thermal conduction) by inner container of icebox.Its measuring method is as follows: the inner container of icebox connection power supply of being closed and regulation and control are good; Form hot-fluid from its inside and outside surface; After setting up a kind of steady state (thermal equilibrium), measure the power that is consumed; The RHL value is exactly for keeping the power (is unit with the watt) of the required consumption of inside and outside predetermined temperature difference (this moment, the used temperature difference was 20 ℃).In table 1, the RHL of sample foams plastics represents that with respect to reference foam plastics (embodiment 1) latter's RHL is set at 100.Only the refrigerator of model 1 has been measured its RHL value.
Measurement result is shown in the following table 1.
Table 1
The embodiment sequence number ????1 ??2 ????3 ????4 ????5
Polyvalent alcohol Weight part ????100 ?100 ????100 ????100 ????100
Water Weight part ????2.1 ?2.1 ????2.1 ????2.1 ????2.1
Pentamethylene Weight part ????15 ?10.5 ????10.5 ????10.5 ????10.5
Iso-pentane Weight part ?4.5 ????2.0 ????1.0
Trimethylmethane Weight part ????3.5 ????1.5 ????2.5
Isocyanic ester Weight part ????144 ?144 ????144 ????144 ????144
Emulsification times Second ????4 ?4 ????3
The wire drawing time Second ????38 ?37 ????38 ????37 ????38
Free initial density-emitting kg/m 3 ????23.2 ?22.5 ????22.7 ????22.9 ????22.7
Flow index ????1.00 ?1.15 ????1.06 ????1.12 ????1.08
????λ mW/mK ????20.0 ?20.3 ????20.8 ????20.3 ????20.5
Foaming degree Do not have Do not have Severe Do not have Slightly
Filling weight
Model 1 g ????3300 ?3000 ????2900 ????3000 ????3000
Model 2 g ????6600 ?6000 ????6000 ????5800 ????5900
Oppositely heat leak %??  ????100 ?101 ????104 ????101 ????103
The result shows in the table, adopts the porous plastics (embodiment 4 and 5) according to blowing agent blends foaming of the present invention to have lower density than the porous plastics of only using pentamethylene (embodiment 1) foaming; In addition, the flowability of porous plastics batching of the present invention is improved, thereby causes lower refrigerator filling weight.Compare with the porous plastics that adopts pentamethylene/iso-pentane mixture (embodiment 2) foaming, porous plastics of the present invention also obtains lower filling weight.
Compare with the porous plastics (embodiment 3) that adopts pentamethylene/Trimethylmethane mixture foaming, porous plastics of the present invention batching also obtains good mobility (lower filling weight, especially more obvious for compound refrigerator) and heat-insulating property (λ and energy expenditure) preferably.

Claims (8)

1. make the method for urethane or urethane-modified poly-isocyanurate rigid foam, this method comprises the step that a kind of organic multiple isocyanate and a kind of many functional group isocyanates's reactive component are reacted in the presence of a kind of blowing agent blends, this blowing agent blends comprises pentamethylene and the iso-pentane of 10~50wt% and/or the mixture of Skellysolve A and Trimethylmethane and/or normal butane of 50~90wt%, and wherein iso-pentane and/or Skellysolve A are 5/95~95/5 to the weight ratio of Trimethylmethane and/or normal butane.
2. according to the process of claim 1 wherein that the content of pentamethylene is 60~80wt% in blowing agent blends, and the content of iso-pentane and/or Skellysolve A and Trimethylmethane and/or normal butane mixture is 20~40wt%.
3. according to the method for claim 1 or 2, wherein iso-pentane and/or Skellysolve A are 75/25~25/75 to the weight ratio of Trimethylmethane and/or normal butane.
4. according to the method for claim 3, wherein iso-pentane and/or Skellysolve A are 2/1~1/2 to the weight ratio of Trimethylmethane and/or normal butane.
5. according to any one method in the aforementioned claim, wherein said blowing agent blends comprises pentamethylene, iso-pentane and Trimethylmethane.
6. according to the method for claim 5, wherein said blowing agent blends is selected from following mixture: the mixture that is made of 70wt% pentamethylene, 20wt% iso-pentane, 10wt% Trimethylmethane, the mixture that constitutes by 70wt% pentamethylene, 10wt% iso-pentane, 20wt% Trimethylmethane, the mixture that constitutes by 75wt% pentamethylene, 15wt% iso-pentane, 10wt% Trimethylmethane.
7. urethane that makes according to the method for any one defined in the aforementioned claim or urethane-modified poly-isocyanurate rigid foam.
8. the isocyanate-reactive composition that comprises any one defined blowing agent blends in the claim 1~6.
CN99803273A 1998-02-25 1999-01-21 Process for rigid polyurethane foams Pending CN1292013A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP98103259 1998-02-25
EP98103259.2 1998-02-25

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CN1292013A true CN1292013A (en) 2001-04-18

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US (1) US20010014703A1 (en)
EP (1) EP1058709A1 (en)
JP (1) JP2002504609A (en)
KR (1) KR20010041256A (en)
CN (1) CN1292013A (en)
AR (1) AR018565A1 (en)
AU (1) AU748858B2 (en)
BR (1) BR9908189A (en)
CA (1) CA2318300A1 (en)
HU (1) HUP0105020A2 (en)
ID (1) ID25632A (en)
NZ (1) NZ505756A (en)
PL (1) PL342545A1 (en)
SK (1) SK12712000A3 (en)
TR (1) TR200002470T2 (en)
WO (1) WO1999043742A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101654507B (en) * 2009-09-30 2011-09-28 大庆油田有限责任公司 Low temperature high strength fluorine-free polyurethane foam heat insulation material
CN110343227A (en) * 2019-08-09 2019-10-18 南京红宝丽聚氨酯有限公司 A kind of hard polyurethane foams of extremely-low density and preparation method thereof

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6348515B1 (en) * 2000-09-06 2002-02-19 Atofina Chemicals, Inc. Blowing agent blends
GB2553072B (en) * 2015-05-22 2021-07-07 Linde Ag Blowing agent

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3933335C2 (en) * 1989-10-06 1998-08-06 Basf Ag Process for the production of rigid polyurethane foams with low thermal conductivity and their use
DE4303659C2 (en) * 1993-02-09 1996-09-05 Bayer Ag Use of mixtures of hydrocarbons and caprolactam hydrate as blowing agents in the production of foams based on isocyanate
GB9403334D0 (en) * 1993-04-23 1994-04-13 Ici Plc Process for rigid polyurethane foams
US5519065A (en) * 1994-03-11 1996-05-21 Imperial Chemical Industries Plc Process for rigid polyurethane foams
US5451615A (en) * 1994-10-20 1995-09-19 The Dow Chemical Company Process for preparing polyurethane foam in the presence of a hydrocarbon blowing agent

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101654507B (en) * 2009-09-30 2011-09-28 大庆油田有限责任公司 Low temperature high strength fluorine-free polyurethane foam heat insulation material
CN110343227A (en) * 2019-08-09 2019-10-18 南京红宝丽聚氨酯有限公司 A kind of hard polyurethane foams of extremely-low density and preparation method thereof

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BR9908189A (en) 2000-10-24
ID25632A (en) 2000-10-19
WO1999043742A1 (en) 1999-09-02
TR200002470T2 (en) 2001-01-22
JP2002504609A (en) 2002-02-12
HUP0105020A2 (en) 2002-04-29
EP1058709A1 (en) 2000-12-13
NZ505756A (en) 2002-02-01
SK12712000A3 (en) 2001-02-12
AU748858B2 (en) 2002-06-13
US20010014703A1 (en) 2001-08-16
KR20010041256A (en) 2001-05-15
PL342545A1 (en) 2001-06-18
AU2620699A (en) 1999-09-15
AR018565A1 (en) 2001-11-28

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